Like in any other building you think of making a purchase, you have to look at the buildings financials. In general, when you see it is a cash purchase only, it is an indication the buildings financials aren't in the best of shapes. However, there are buildings with decent financials, with money in reserve funds, etc. There are some 550 HDFC buildings in Manhattan with many different programs
These are great if you are looking for a place to live for quite some time as the majority will have a flip tax.